catalytic cracking

noun

: cracking of petroleum oils (as gas oils or diesel oils) especially for the production of high-octane gasoline in the presence of a catalyst (as clay) in various forms (as pellets or beads either stationary in a fixed bed or moving through the oil or as a fine powder fluidized by a stream of air or hydrocarbon vapors)

—distinguished from thermal cracking

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now